When carrying very heavy loads is the primary consideration in choosing a highway tractor frame, which of the following would be the best choice?

A. deep-section, 3/8" (10 mm) double rail, tempered steel frame
B. high-strength magnesium-silicon-aluminum alloy frame
C. non-fish-plated, middle alloy steel
D. pressed box-section ladder frame with drop-style crossmembers


Answer: A

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